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  • A basketball is a spherical inflated ball used in a game of basketball. Basketballs typically range in size from very small promotional items only a few inches in diameter to extra large balls nearly a foot in diameter used in training exercises to increase the skill of players. The standard size of a basketball in the NBA is 29.5 to 29.875 inches in circumference. Nearly all basketballs have an inflatable inner rubber bladder, generally wrapped in layers of fiber and then covered with a tacky surface made either from leather, rubber, or a synthetic composite. As in most inflatable balls, there is a small opening that allows the pressure to be increased or decreased. The surface of the ball is nearly always divided by "ribs" that are recessed below the surface of the ball in a variety of configurations and are generally a contrasting color. A brown surface with black ribs and a possible logo is the traditional color scheme of basketballs but they are sold in various colors. Balls are generally designated for indoor, or all-surface use. Indoor balls tend to be considerably more expensive than all-surface balls due to cost of materials.

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